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About This Item
Full Description
1.1 This practice outlines procedures for the petrographic examination of samples of hardened concrete. The samples examined may be taken from concrete constructions, they may be concrete products or portions thereof, or they may be concrete or mortar specimens that have been exposed in natural environments, or to simulated service conditions, or subjected to laboratory tests. The phrase “concrete constructions” is intended to include all sorts of objects, units, or structures that have been built of hydraulic cement concrete.
Note 1: A photographic chart of materials, phenomena, and reaction products discussed in Sections 8 - 13 and Tables 1-6 are available as Adjunct C856 (ADJCO856).
1.2 The petrographic procedures outlined herein are applicable to the examination of samples of all types of hardened hydraulic-cement mixtures, including concrete, mortar, grout, plaster, stucco, terrazzo, and the like. In this practice, the material for examination is designated as “concrete,” even though the commentary may be applicable to the other mixtures, unless the reference is specifically to media other than concrete.
1.3 The purposes of and procedures for petrographic examination of hardened concrete are given in the following sections:
| Section |
| |
Qualifications of Petrographers and Use of Technicians | 4 |
Purposes of Examination | 5 |
Apparatus | 6 |
Selection and Use of Apparatus | 7 |
Samples | 8 |
Examination of Samples | 9 |
Specimen Preparation | 10 |
Visual and Stereomicroscope Examination | 11 |
Polarizing Microscope Examination | 12 |
Paste Features | 13 |
Report | 14 |
1.4 The values stated in inch-pound units are to be regarded as the standard. The SI units in parentheses are provided for information purposes only.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. A specific hazard statement is given in 6.2.10.1.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Document History
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ASTM C856/C856M-20
Standard Practice for Petrographic Examination of Hardened Concrete- Most Recent
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ASTM C856-18a
Standard Practice for Petrographic Examination of Hardened Concrete- Historical Version
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ASTM C856-18
viewing
Standard Practice for Petrographic Examination of Hardened Concrete- Historical Version
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ASTM C856-17
Standard Practice for Petrographic Examination of Hardened Concrete- Historical Version
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ASTM C856-14
Standard Practice for Petrographic Examination of Hardened Concrete- Historical Version
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ASTM C856-13
Standard Practice for Petrographic Examination of Hardened Concrete- Historical Version
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ASTM C856-11
Standard Practice for Petrographic Examination of Hardened Concrete- Historical Version
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ASTM C856-04
Standard Practice for Petrographic Examination of Hardened Concrete- Historical Version
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ASTM C856-02
Standard Practice for Petrographic Examination of Hardened Concrete- Historical Version
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ASTM C856-95e1
Standard Practice for Petrographic Examination of Hardened Concrete- Historical Version